Thanks everyone. I will experiment and try everyone's advice, and see where it gets me. When all is said and done, I will let you know if I have been able to get things back to "normal" as it were.
Addressing the collective. The moving a PDF over to ilIlustrator solves by overall problem. I will continue to try to understand why the enlargement thing happened to begin with, but if I encounter that again, I can simply bring a PDF over and work from there. It's an extra step, but solves my overall issue.
There was the mention of perhaps having issues related to fonts. There are letters in several of my images, but no fonts. Each letter is an individual vectored piece. This is a trick I learned in order to make sure that pieces of artwork are more historically precise as I redraw them. I am able to place individual letters exactly where they need to be, as opposed to settling for wherever a vector drawing platform places them via there font parameters.
Thanks to everyone who chimed in. This is my first experience with any type of online support group. You guys are awesome!
Clay